參數(shù)資料
型號(hào)： MAX4159
廠商： Maxim Integrated Products, Inc.
英文描述： 350MHz 250MHz, 2-Channel Video Multiplexer Amplifiers(350MHz 250MHz,雙通道視頻多路放大器)
中文描述： 350MHz/250MHz、2通道視頻多路復(fù)用器-放大器
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 203K
代理商： MAX4159
M
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
10
______________________________________________________________________________________
_______________Detailed Desc ription
The MAX4158/MAX4159 are optimized for closed-loop
gains (A
VCL
) of 1V/V (0dB) or greater; the MAX4258/
MAX4259 are optimized for closed-loop gains of 2V/V
(6dB) or greater. These low-power, high-speed, cur-
rent-mode feedback amplifiers operate from ±5V sup-
plies. They drive video loads (including 50
and 75
cables) with excellent distortion characteristics.
Differential gain and phase errors are 0.01%/0.01° for
MAX4158/MAX4159 and 0.01%/0.02° for MAX4258/
MAX4259, respectively.
The input multiplexers feature very short switching
times and small switching transients. They also have
high input resistance and constant input capacitance,
so overall input impedance can be set by external input
terminating resistors. Each video input is isolated by an
AC-ground pin, which reduces channel-to-channel
capacitance and minimizes crosstalk.
The MAX4159/MAX4259 have address latching and an
output enable function that places the output in a high-
impedance state. These functions allow multiple
mux/amps to be paralleled together to form larger
switching arrays.
________________________Truth Tables
Input Control Logic
X = Don’t Care
MAX 4159/MAX 4259
Output Control Logic
All logic levels (
EN
, LE, and A0) default low (0) if left open circuit.
Output disable is completely independent of input address and
latch.
__________Applic ations Information
T heory of Operation
Since the MAX4158/MAX4159/MAX4258/MAX4259 are
current-mode feedback amplifiers, their open-loop
transfer function is expressed as a transimpedance,
V
OUT
/
I
FB
, or Z
T
. The frequency behavior of this
open-loop transimpedance is similar to the open-loop
gain of a voltage-mode feedback amplifier. That is, it
has a large DC value and decreases at approximately
6dB per octave at high frequency.
Analyzing the current-mode feedback amplifier in a
gain configuration (Figure 1) yields the following trans-
fer function:
V
OUT
/ V
IN
= G x Z
T(S)
/ (Z
T(S)
+ G x R
IN(FB)
+ R
F
)
where G = A
VCL
= 1 + R
F
/ R
G
.
At low gains, G x R
IN(FB)
<< R
F
. Therefore, unlike tradi-
tional voltage-mode feedback amplifiers, the closed-
loop bandwidth is essentially independent of
closed-loop gain. Note also that at low frequencies,
Z
T
>> [G x R
IN(FB)
+ R
F
] so:
V
OUT
/ V
IN
= G = 1 + R
F
/ R
G
Layout and Power-S upply Bypassing
The MAX4158/MAX4159/MAX4258/MAX4259 have
extremely high bandwidth, and consequently require
careful board layout, including the possible use of con-
stant-impedance microstrip or stripline techniques.
MAX4158
MAX4159
MAX4258
MAX4259
R
G
FB
Z
T
R
IN(FB)
OUT
+1
IN0
IN1
V
IN
R
F
+1
Figure 1. Current-Mode Feedback Amplifier
On
Off
AMPLIFIER
OUTPUT
0
1
Output on
Output off; high impedance
LOGIC
INPUT
(
EN
)
FUNCTION
LE
A0
AMPLIFIER
INPUT
LOGIC
INPUTS
FUNCTION
[LAST]
1
X
Channel addresses latched;
retains last input address.
IN1
0
1
Channel 1 selected
IN0
0
0
Channel 0 selected
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4159EEE 功能描述:視頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel
MAX4159EEE+ 功能描述:視頻放大器 350/250MHz 2Ch Video MUX-Amplifier RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel
MAX4159EEE+T 功能描述:視頻放大器 350/250MHz 2Ch Video MUX-Amplifier RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel
MAX4159EEE-T 功能描述:視頻放大器 RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel
MAX4159ESD 功能描述:視頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel
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